Arm sling



FIG. 1 is a perspective view of an arm sling showing my new design;

FIG. 2 is a front view of an arm sling showing my new design;

FIG. 3 is a left side view of an arm sling showing my new design;

FIG. 4 is a back view of an arm sling showing my new design;

FIG. 5 is a right side view of an arm sling showing my new design;

FIG. 6 is a top perspective view of an arm sling showing my new design; and,

FIG. 7 is a bottom perspective view of an arm sling showing my new design.

The broken lines in the drawings represent unclaimed environmental subject matter. 

The ornamental design for an arm sling, as shown and described. 